One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6)(7,13)(8,11)(9,12)(10,15)(14,19)(16,18)(17,20)(23,32)(25,36)(27,35)(29,34) involution — undirected(5,7)(6,10)(8,14)(9,15)(11,17)(12,13)(16,20)(18,19)(21,22,26,30)(23,25,32,36)(24,28,33,31)(27,34,35,29)(2,4)(5,8,9,16)(6,11,12,18)(7,14,15,20)(10,17,13,19)(21,23,33,34,26,32,24,29)(22,27,28,36,30,35,31,25)(6,12)(10,13)(11,18)(17,19)(21,24,26,33)(22,28,30,31)(23,34,32,29)(25,35,36,27)(7,15)(10,13)(14,20)(17,19)(21,25,33,27,26,36,24,35)(22,29,28,23,30,34,31,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.